Abstract: At present，the prevention and control of groundwater pollution in coal mine sites was still in the primary stage，the lack of a groundwater pollution prevention and control system for the entire life cycle of a mine caused some problems such as improper prevention and control of groundwater pollution and aggravation of pollution，etc..Based on the scientific definition of pollution sites and groundwater pollution assessment units in coal mine sites，study progress and development directions of the monitoring，early warning，prevention and control technology of groundwater pollution in coal mine sites were discussed.Based on the definition of contaminated sites，the groundwater contaminated site and groundwater contaminated flow field units in the coal mine sites were scientifically defined，and the scopes of groundwater contaminated site and groundwater flow field assessment in the coal mine sites were also defined.The types and patterns of groundwater pollution in coal mine sites were analyzed，and the main characteristic pollution factor during coal mining and pit closure were explained.Based on the groundwater pollution risk theory，the status quo of groundwater pollution monitoring and early-warning technology in coal mine sites were analyzed.From the perspectives of mine production and pit closure，the existing water-preserved-mining technology methods based on strata control，blocking materials，and underground water storage were described.The active and passive technical means of the process of pit closure and groundwater pollution prevention and control after the pit closure were described.Based on the above analysis results，according to the characteristics of different stages of the entire life cycle of mine，it points out that development directions of the prevention and control technology of ground water pollution in coal mine sites are mainly for conducting accurate detection of groundwater pollution，study and development of intelligent identification，monitoring and early warning technology and equipment of specific pollutant，study the key technologies such as source control，process blocking and end remediation of groundwater pollution in coal mining area，so as to form the technical system and standard prevention and control of groundwater pollution throughout the life cycle of coal mining area.The above study results can provide certain reference for the prevention and control of groundwater pollution in mines.

Key words: mine ecological remediation, groundwater pollution, abandoned mine, monitoring and early warning, technical system